The Amazon page says the chuck capacity is 0.3 to 3.2 mm but, as is obvious from the picture above, it can accept the 4 mm hex that is a standard for miniature screwdriver bits.

This means I can use these miniature bits in the electric screwdriver. Give the torque available from the latter, I never use it to seat the screw. It's used to extract long miniature screws or run them in to near seating after which final tightening is done with a handheld driver.

Given the 1/4" shank, there are probably other uses for this tool.

Since I wrote the above, Wiha has come out with a 1/4" to 4mm adaptor...